Assiqnob to independent pneumatic



July 17,1928. 1,677,199

J. T. NELSON HMiDLE LOCK FOR PNEUMATIC TOOLS Filed Jan. 14, 1925 JOHN T. NELSON, or AURORA, ILLINoIs,

1,677,199 PATENT OFFICE.

ASSIGNOR TO INDEPENDENT PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

HANDLE LOOK FOR PNEUMATIC TOOLS.

Application filed January This invention relates to handle locks for pneumatic tools, such as hammers, and has for one of its objects the provision of an improved lock wherein the locking collar is held from rotation by engaging flat faces on the barrel, thereby providing a rigid and stron I connection using the stock of the barrel:

;A further object of my inventlon 18 to employthe flats on the barrel as a means for adjustment of the collar to bring its teeth in proper register With those on the handle the extent of adjustments being determine by the number of flats on the barrel.

Other and further objects of my invention will appear from the following specification taken in connection with the accompanying drawings, in which I Fig. 1 is a side View of a pneumatic hammer provided with a handle lock of my invention;

Fig. 2 is an enlarged vertical sectional view on line 2-2 of Fig. 1; I

Fig. 3 is a sectional view on line 33 of Fi .2-

ig. 4 is a vertical sectional View on line 4-4 of Fig. 1 through the polygonal portion of the barrel at the locking collar; and

Fig. 5 is a perspective view of the clip.

The. pneumatic tool shown in Fig. 1 has a barrel 1 and a handle 2, the latter having screw-threaded connection with the former by providing the handle with aitubular part 3 internally threaded to receive the externally threaded inner end of the barrel.

The barrel 1 has a plurality of externalflat faces 4, 4 arrangedabout the same and extending lengthwise of the barrel for a short distance in advance of the threaded inner end of the barrel. This provides the barrel 1 with a polygonal shaped outside portion, as shown in Fig. 4. As there illustrated, there are eight of these faces, which give the barrel an octagonal shape on the outside. Fitting about this portion is a steel lock collar 5 having a bore complementary to the polygonal portion of the barrel (Fig. 4) i so that when engaged with said faces 4 the collar will be held from rotation on the barrel.

Said collar 5 is provided on one side with a plurality of teeth 6 arranged entirely around the same. The end of the tubular part '3 of the handle has complementary teeth 7 arranged entirely around the same 14,1925. SerialNo. 2,369.

and designed to engage the teeth on the collar for holding the handle from unscrewing from the barrel under the jarring and vibrations or the tooth when handled and when in operation. Asplit or'divided ring or clip 8 is employed to hold the collar 5 engaged with the handle part 3. This clip is made of spring steel and is open at one side to be sprung or snapped over the collar 5 and handle part 3, as shown in Figs. 2 and 3. These parts have grooves or channels 9, 10, respectively, to receive the inwardly extending side flanges 11, 11 of the clip. As shown in Fig. 3, these flanges are on an outward bevel or incline, and the inner edges or sides of the grooves or channels 9, 10 are made on a similar slant to slightly spread the flanges and cause them in their eil'ect to contract or springback to draw and hold the collar 5 tightly against the handle so that no opportunity is afiorded for the handle to work loose on the-barrel by turning.

As shown b dotted lines in Fig. 1, the barrel 1 in a Vance of the flat faces 4 is cylindrical and of a diameter to allow the collar 5 tobe slid oil the flats 4 for turning the collar about the barrel to adjust its teeth for proper registerflor fit with those on the handle end 3, With this portion of the barrel beingoctagonal in shape, eight adjustments are allowed for the collar 5. When the handle 2 is screwed down tight on the barrel 1, the collar 5 is slipped over the barrel and turned from one flat 4 to the other until the teeth fit. Finer adjustments may be had by making more flats 4 on the barrel, .forinstance ten or twelve, but the number shown is ample for most cases for the handle can always be drawn up 1/64 of an inch if necessary.

With the tool shown, the number of teeth on the handle and collar is thirty-three, and the space between the teeth is approximately of an inch, so that each time the collar 5 is turned it will make a difference of about 1/32 of an inch and there will always be a place where the parts will fit tightly together. With the flats 4, the connection between the collar 5 and the barrel 1 is direct and the metal stock of the barrel used to hold the collar from turning, thus making a rigid and strong connection and avoiding the use of frail and losable keys.

The details of structure and arrangement of parts maybe variously changed and and scope of my invention.

1 claim as my invention:

l. The combination with two members having screw-threaded connection, of means for locking said members against turning relatively to each other, comprising a polygonal shaped portion on one member, a collar having a complementary bore to fit said polygonal portion, said collar and the other member having engaging teeth about the same, and a clip having flanges engaging grooves in said collar and the last named member for holding the collar engaged therewith. i

2. In a pneumatic tool, the combination with a handle and a barrel having screwthreaded connection, of ahan-dle lock comprising a multiplicity of flat faces formed on the exterior of the barrel adjacent its connection with the handle and arranged completely about the same, a collar slidably mounted on the barrel and having a bore with flat faces to fit against those on the barrel for holding the collar againstturning on the barrel, said collar and handle having interengaging teeth on their opposed edges and completely, surrounding the barrel, and means for rigidly holding the collar with its teethcngaged with those .of the handle for locking the handle against turning on the barrel: 1

3. In a pneumatic tool, the combination with a handle and a barrel having screwthreaded connection, ofa handle lock comprising a multiplicity of flat faces formed on the exterior of the barrel adjacent its connection with the handle and arranged completely about'the barrel, a collar slidably mounted on thebarrel and having a bore with flat faces to fit against those on the barrel for holding the collar against turning on the barrel, said collarand handle having exterior grooves about the same and having interengaging teeth on their opposed edges and completely surrounding the same, and a split spring clip having flanges to engage in 1 pletely about the barrel, a collarslidably mounted on the barrel and having a bore th exterior of the barrel adjacent its connection with the handle and arranged comwith flat faces to fit against those on the barrel for holding the collar against turning on the barrel, said collar and handle having exterior grooves extending about the same and v having interengaging teeth on their opposed edges and completely surrounding the same,

in said grooves for holding the collar with its teeth engaged with those of the handle to lock the handle against turning on the barrel, said flanges and grooves being inclined a'split spring clip having flanges to engage so that the clip on being applied will draw the collar into tight contact with the handle.

5. Ina pneumatic tool, the combination with a handle and a barrel having-screwthreaded connection, of a handle lock comprising flat faces formed on the exterior of the barrel adjacent its connection with the l'ia'ndle, a collar slidably. moutned on the barrel and having a borewith flat faces to fit against those on the barrel for holding the collar against turning on the barrel, said.

collar and handle having interengagingv teeth on their opposed edges, and means for holding the collar with its teeth engaged with those of the handle for locking the handle against turning on the barrel, said collar being adjustable about the barrel when slidotl the flat faces thereon for bringing the teeth on the collar and handle into proper register after screwing the handle tight on the barrel.

In testimony that I claim the foregoing as my invention, I aflix my signature this 9th day of January, 1925.

JOHN T. NELSON. 

